Compound centrifugal pump.



PATENTED DEC. 11, 1906 0. WEBBER. COMPOUND GENTRIFUGAL PUMP; APPLIUATIQN FILED DEC. 31, 1903.

f NiTEn STATES OFFICE.

WILLIAM O. WEBBER, OF BOSTON, MASSACHUSETTSASSIGNOR TO LAW- I RENCE MACHINE COMPANY, OF LAWRENCE, MASSACHUSETTS. 1

COMPOUND cENTmFdeAL PUMP.

Specification of Letters Patent.

Patented Dec. 11, 19cc.

duplication filed December 31. 1903. erial No. 187.389.

To all whom/it mwy'concern: v i

Be it known that 1, WILLIAM OLIVER 'WEBBER, a citizen of the UnitedStates, and

a resident of the city of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Compound Centrifugal Pumps; and I hereby declare that the following is a clear, full, and exact description of the same, reference being had to the accompanying drawings fo'rming a art of this specification, in

- which similar aracters represent the corresponding parts in all the views.

This invention relates to that class of centrifugal pumps in which the discharge from one pump is connected to thel inlet of a sec- 0nd pump, and so on by successive stages through any number of pumps that may be desired, and has for its object the arrangement. of such pumps so that the end thrust upon their disks or runners may result in counterbalancing'or neutralizing the thrust upon them as a Whole, this being of prime I importance when um ing under the high heads for which t 's c ass of pump is primarily designed. i

In Figure 1 a half vertical section is shown of a four-stage pump above thechorizontal center line of the shaft and a half side elevation below said center line. Fig. 2 shows a half vertical section of same pum on the line X Y of Fig. 1 above the center inc and a half end elevation below the center lines,

A is a cylindrical outer casing of a pump provided with-the water-passages a a? a a and discharge-outlet a. This cylindrical casing is closed at one end by the inlethead B, which is bolted to the cylindrical outer casing A by the bolts 6. This inlethead has an inlet passage-way'b and is pro vided with a stufiing-box b, which may be of any suitable construction. The opposite end of the main casing is closed by the 'head C, which is secured to the main casing A by the bolts 0 and is provided with a cap c, in

'tegraltherewith, which covers the end of the shaft D, also with a water-passage c; At or near the middle of the axial length of the the whirl col-space f into the annular out let cham er a Next adjacent to the fourth disk is another annular section G,-pr'ovided with a'water passage-way g. This annular section is also fixedly held in the outer casing A.- Next adjacent to this section is the first inclosed disk or runner H, provided with a waterassage it. Next adjacent to the centrallyocated annular section E on the 0 posite side from those just described is't e third inclosed runner or disk I,'provided with a water-passage 'i. Next adjoining this disk I is another annular section J, provided with a water-passage y'. This section J is also fixjoining this section J is the second runner K,

provided with a water passage-way 7c. All

of these disks or runners are tightly keyed to the shaft D and abutone against the other.

A running fit is maintained between these disks and the annular interior sections wherever they come in contact, as shown in the drawings.

z ,2. .z 2 are annular cored openings'for the sim le purpose of lightening the castings.

he action of this pum is as follows: The shaft D being set in revo ution Water enters the inlet. passage-way 6, passes into the first disk H, and is thrown out throu h the passage-way 7L by the action of the bTades of the disk L, which may be of any approved form. The water thus thrown from the first disk passes up through the passage-way a in the outer casing A, in the direction shown by the arrows, enters the passage-way c of the cover 0, in which it is maintained at a certain presaccelerated, passing through the passage-way.

'i of the disk I into the passage-way a of the outer casing A, thence following the arrows through the passage-way g ofthe annular section G, under still greater pressure and velocity, into the fourth disk F, thence b the small passage-way f of this disk throng the whirlpool-space f, and is finally dehvered into the annular outlet-chamber a under its maximum. pressure and velocity, and is thence discharged through the delivery passageway into the annular pas i '9 sure and velocity by the centrifugal action of velocities of discharges. To illustrate,'assuming a pressure of twenty-five pounds on each successive disk, the first disk H would havea pressure of twenty-five pounds bearto merely a four-sta e pump, 39 1 ing upon the unbalanced portion thereof and forci g it toward the right hand, as shown in The second disk K would be under Fig. 1

it in the a pressure of fifty ounds, for'cin same way toward t e left. The third disk I.

would be under a pressure of seventy-five pounds, forcing it in the same manner toward the. left. The fourth disk F would be under a pressure of one hundred pounds, forcing it in the same manner toward the right. Therefore there would be a pounds on H and one hundred pounds on F to the right, a total of one hundred and talent fiveEpounds, and a thrust of fifty poun s on and seventy-five pounds on I to the left, making one hundred an twentyfive ounds', and the pressures would balance. W l1ile I have illustrated by the drawings a four-stage compound centrifugal pump, it is evident that tlns combination can be carried on indefinitely, and I do not wish to be limited i but to any combination having a p urality of disks.

The arrangement of the impellers and con-. necting shar whic h owing to the velocity of the liquid roduoes eddies and loss of power and rovides assages with easy curves, which a low the iquid to change its velocity without friction or constraint. Furthermore, this structure equalizes the strain upon the casing and removes the heavy pressures from the stuffingbox ends of the ump and places it in the center, thus avoidin the inequality of strain u on the case and the heavy pressure u on independently al.

t e stuffing-boxes. By ancing the inlet and discharge pressures all thrust is obviated and the use of balancingnot necessary. This structure the variation in the lift of the the pump out of chambers is also prevents first impeller from throwin balance, as well as the mechanical variations in-the pump-castings, which can only thus be ade' uately balanced.

aving fully described the construction and operationof this invention, what 1 desire to claim and secure by Letters Patent, is

as follows:

1. In a compound centrifugal pump, a series of impellers constructed and arranged to discharge from the first into the last of the series, and from the last impeller into the next adjacent thereto.

2. In a compound centrifugal pump provided with a si gle suction-inlet the construction and arrv.

thrust of twenty-five.

passages therein shownitvoid short water pas'sages between the impellers,

znent of the impellers, scri ally d ii'osed under the least pressure at the l 3. In a compound centrifugal pump, a plurality of impellers, "means for conveylng the discharge from one outer impeller to the outerimp'eller at the opposite side of the pump, means for conveying the discharge from the last-mentioned impeller to the impellernext adjacentthereto and therefrom to an impeller intermediate of the first-mentioned impeller.

4. rality of oppositely-disposed im ellers, those upon each side of the center of t posed in the same direction, and means for conveying the discharge from one outer impeller to the outer im eller at the opposite side of the pump and t ence to an intermediate impeller.

5. In a compound centrifugal pump, a series of impellers constructed and arran ed to the series, from the last impeller into theimpeller next adjacent thereto, from this imirstimpeller' of t 1e series, and so on.indefinitely, each two adjacently connected impellers, after the first impeller, facing in the same direction and directly connected .together by a passage-way at one side 'of the central dischargi-iw-irnpeller, the passageway leading from file discharge of each air similarly-disposed pair of im ellers, facing in the opposite direction, on t e opposite side of the central impeller,- the discharge from the last pair ofimpellers so placed, entering the central dischargeimpeller on the side op-- of impellers, the discharge from the final cening of the pump. 7 6. In a compound centrifugal pum a plurality of oppositely-disposed impe ers arranged in two series, those in each series successively facing in one direction, a channel extending between the outer impeller of each series, and a discharge-passage communicating with an intermediate impeller of the series.

7.. In a compound centrifugal pump, a series of impellers constructed and arm!) ed to discharge from the first to the last impe ler of peller into the ini 1e series, and so on indefifirst impeller of t nitcly, each two adjacently-connectcd imof impellers so placed, connectingwit a trally-disposed impeller directly connected with the vortex-chamber and discharge-'open- In a compound centrifugal pump, a plue pump disdischarge from the first to the last impe ler of eller into the im eller next adjacent to the posite to that of the entrance of the last pair the series, from the last impeller into the impcllers, after the first impeller, facing in the isamc direction and directly connected together by :1 1passapuw-way at one side of the central discurging-impeller, the passageway leading from the discharge of each air side to that of t e last pair of im ellers.

8. In' a quadruple compoun centrifugal pump, a plurality of impellers disposed in pairs'facing inopposite directions and constructed and arranged Whereloy the first im+ eller discharges into the fourth impeller, the ourth impeller into the third impeller, and the third into the'second impeller, serially 9. In a quadruple dompound centrifugal pump the construction and arrangement of 7 second lmpel our impellers in pairs successively disposed in opposite directions and operatively connecting the first imp ler with t 1e fourth, a passage'o eratively'connecting' the fourth impeller wit 1 the third, a passage connecting the third impeller with the second impeller, and a ,passage operatively connecting the er with the pump-discharge 'serially disposed.

10. In a quadruple compound centrifugal pump, an outer envelop provided with water-passages, heads secured to the outer casing an naled 1n said heads,

formin bearin s, a shaft jourimpe lers operatively mounted upon said shaft, partitions containing water-passages fixedly held ih said outer casing and alternately disposed in relation to the impellers, a passa e operativelyconnect-Y mg the first with-the ourth 'a passage operatlvely connecting'the fourth With the third,

a passage operativel connecting the third with the second,"an a passage operatively the inlet connecting the second with the discharge, serially disposed, the first and second facing in one direction and the third and fourth facing in the opposite direction.

' 11. In amultistage centrifugal pump the combination with' a casing containing a series of impeller-chambers in alinem'ent, of a plurality of rotary impellers, each in one of 7 said chambers, and passages in the casing connecting the chambers for serial operation of the im ellers, the chamber connected with heing at one end of the series, and that connected with the outlet being an intermediate one of the series.

12. In a multistage centrifugal pump, the

combination with a casing containing a series of impeller-chambers in alinement, of two or more pairsof rotary impellers each impeller in one of said chambers, a shaft carrying said impellers, and passages in the casing connecting said chambers for serial operationof the impellers, said passages and impellers being so arranged that the impellers of each successive independent pair, in the order of their operation, beginning with the first impeller, face in opposite directions, and the impellers'of each successive independent pair beginning With-the second impeller, face inthe sarif'ie direction, the chamer connected with the inlet being at one end of the series of chambers injalinem'ent, and that connected with the outlet being an intermediate one of the series.

In testimony whereof I have hereunto afsubscribing witnesses.

WM. 0. WEBBER.

fixed my signature in the presence of 'two' 

